This is the Multiples Choice Questions Part 12 of the Series in General chemistry as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.
Online Questions and Answers in General Chemistry Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part XII of the Series
Choose the letter of the best answer in each questions.
551. The 1938 edition of the CRC handbook lists "Masurium"as an element. The element was named for the German province of Masur. What is the modern name for masurium?
- a.) technetium
- b.) francium
- c.) niobium
- d.) astatine
552. What is "Cardamist"?
- a.) a spice
- b.) a nervous gas
- c.) a paper additive
- d.) nitroglycerin
553. Arsphenamine has a common name: "606". Where did that name come from?
- a.) It was the 606th and first successful compound in the search for a syphilis treatment.
- b.) One gram of the compound is toxic enough to kill606 mice.
- c.) 606 is the compound’s molecular weight.
- d.) The molecule is shaped like the numerals in "606".
554. What is the most abundant type of atom in living things?
- a.) oxygen
- b.) hydrogen
- c.) sodium
- d.) carbon
555. An electromagnetic wave can be produced by
- a.) a stationary uncharged particle
- b.) a stationary charged particle
- c.) an oscillating, uncharged particle
- d.) an oscillating charged particle
556. When the wavelength of electromagnetic radiation is increased by 10 percent, the frequency of the radiation
- a.) increases by 10 percent
- b.) decreases to 10/11 its original value
- c.) decreases by 10 percent
- d.) is unchanged
557. When the frequency of electromagnetic radiation is increased by 10 percent, the energy of one photon of the radiation
- a.) is unchanged
- b.) decreases by 10 percent
- c.) increases by 10 percent
- d.) decreases to 10/11 its original value
558. A quantum number n arises in the electron-on-a-wire model because
- a.) the amplitude of the wave is restricted
- b.) the deBroglie relation contains a quantum number
- c.) the energy of a moving particle can take on any value
- d.) the wavelength on the wire can take on only certain values
559. Increasing the wavelength of visible light
- a.) shifts its color towards the red end of the spectrum
- b.) increases its brightness
- c.) shifts its color towards the blue end of the spectrum
- d.) increases its saturation
560. The Pauli exclusion principle
- a.) states that electrons have wavelike behavior
- b.) limits the number of electrons that can occupy an orbital to 2.
- c.) says that all electrons in an orbital have the same set of 4 quantum numbers.
- d.) states that the ms quantum number must have values of -1/2 or +1/2.
561. Which of the following is nota property of particles?
- a.) localization
- b.) mass
- c.) velocity
- d.) diffraction
562. Which of the following electron transitions in a hydrogen atom results in the greatest release of energy?
- a.) n = 3 to n = 4
- b.) n = 6 to n = 4
- c.) n = 4 to n = 6
- d.) n = 7 to n = 5
563. Which of the following will have the largest de Broglie wavelength?
- a.) a proton moving at 1000 m/s
- b.) an electron moving at10000 m/s
- c.) an electron moving at1000 m/s
- d.) a hydrogen atom moving at 10000 m/s
564. Which of the following statements about d atomic orbitals is true?
- a.) d orbitals have high amplitude at the nucleus.
- b.) The probability of finding a d orbital electron at the nucleus is high.
- c.) d orbitals are better at shielding outer electrons than sand p orbitals in the same shell.
- d.) d orbitals are less penetrating than sand p orbitals in the same shell.
565. Which series of quantum numbers describes the highest occupied orbital in a ground state mercury atom?
- a.) n = 6, l = 2
- b.) n = 5, l = 2
- c.) n = 4, l = 3
- d.) n = 6, l = 0
566. An atom of silicon in its ground state has how many electrons with quantum number l=1?
- a.) 14
- b.) 2
- c.) 8
- d.) 28
567. Which of the following ionization energies will be highest?
- a.) The first ionization energy of Ca
- b.) The second ionization energy of K
- c.) The second ionization energy of Ca
- d.) The first ionization energy of K
568. Isoelectronic atoms and ions have identical
- a.) electron affinity
- b.) ionization energy
- c.) electron configuration
- d.) effective nuclear charge
569. Effective nuclear charge is
- a.) the charge on the nucleus experienced by an electron when the shielding effect of other electrons is accounted for
- b.) the amount of energy required to remove an electron from the valence shell when the atom is in a gaseous state
- c.) the energy released when a proton is added to the nucleus
- d.) the number of electrons that penetrate the nucleus
570. A hypothesis is
- a.) a theory that has been proved
- b.) obeyed under any circumstances.
- c.) a description of a pattern or relationship in experimental data
- d.) a tentative explanation for a natural phenomenon
571. A number of people become ill after eating dinner in a restaurant. Which of the following statements is a hypothesis?
- a.) Bacteria in the oysters may have caused the illness.
- b.) Everyone who ate oysters got sick.
- c.) The cooks felt really bad about it.
- d.) People got sick whether the oysters were raw or cooked.
572. Which of the following statements is a law?
- a.) Higher altitude means lower boiling points for water, all other things held equal.
- b.) An egg cooks in 17minutes at sea level.
- c.) An egg cooked for 27 minutes in Baltimore was badly overcooked.
- d.) An egg takes less time to cook in Baltimore than in Denver.
573. The statement, "Osmium has a density of 22.59 g/mL, which makes it the densest element known" is an example of:
- a.) an experimental observation
- b.) a hypothesis
- c.) a law
- d.) a theory
574. The statement, "A chemical reaction never creates products that weigh more or less than the reactants", is based on three centuries of experimental observation. The statement is an example of:
- a.) a law
- b.) a datum
- c.) a theory
- d.) a hypothesis
575. A natural law is
- a.) an explanation that has been proved
- b.) obeyed under any circumstances.
- c.) a tentative explanation for a natural phenomenon
- d.) a description of a pattern or relationship in experimental data
576. Vanillin contains 63.15%C, 5.30%H, and 31.55% O whether it is extracted from vanilla beans, synthesized chemically from clove oils, or extracted from wood pulp wastes. Vanillin is most likely to be:
- a.) a solution of C in H and O
- b.) a compound of C, H, and O
- c.) a heterogeous mixture of elements
- d.) a homogenous mixture of elements
577. A blue crystalline material is heated strongly in a test tube. A clear liquid condenses around the mouth of the tube and the crystals gradually lose their blue color and become white powder. Every gram of blue crystal produces 0.36 g of clear liquid and 0.64 g of colorless powder. The same weight relationships are observed for samples of the crystals taken from many different sources. These observations are consistent with the hypothesis that the blue crystals are:
- a.) a heterogeous mixture
- b.) an element
- c.) a wet salt
- d.) a compound
578. The meteorite ALH84001 contains tiny bubbles of gas trapped in the rock. The chemical composition of the gas in these bubbles matches the composition of the Martian atmosphere as determined by Viking spacecraft in the 1970’s.
The meteorite is an example of a(n)
- a.) binary compound
- b.) heterogeneous mixture
- c.) solution
- d.) homogeneous mixture
579. A solid melts gradually between 85°C and 95°C to give a milky,oily liquid. When a laser beam shines through the liquid, the path of the beam is clearly visible. The milky liquid is likely to be:
- a.) a heterogenous mixture
- b.) a solution
- c.) a compound
- d.) an element
580. Smoke is an example of a(n):
- a.) gaseous solution
- b.) compound
- c.) homogeneous mixture
- d.) heterogeneous mixture
581. Antoine Lavoisier, the "father of chemistry",listed lime as a chemical element in his table of33known elements. Which of the following observations shows that lime cannot be an element?
- a.) Lime reacts with water, generating a large amount of heat.
- b.) When a certain soft metal is burned in oxygen, lime is produced (with no other products).
- c.) Lime melts at a temperature of 2572°C.
- d.) Lime and carbon dioxide are produced when limestone is roasted.
582. Which of the following is a physical property?
- a.) corrosiveness
- b.) temperature
- c.) toxicity
- d.) flammability
583. Which of the following is an extensive property of coffee in a mug?
- a.) temperature
- b.) cream added per mL of coffee
- c.) total mg of caffeine
- d.) color
584. In order to decide whether a property is chemical or physical, you must know whether
- a.) chemical or physical changes occur when the property is measured
- b.) the property is intrinsic or extrinsic
- c.) the property involves matter or energy
- d.) measuring the property changes mass or energy
585. Which of the following is an intensive property?
- a.) weight
- b.) density
- c.) number of atoms
- d.) volume
586. The specific volume of a substance is the the volume per gram of substance. Specific volume is an example of
- a.) a physical, intensive property
- b.) a physical, extensive property
- c.) a chemical, intensive property
- d.) a chemical,extensive property
587. Which of the following is a chemical property of a slice of chocolate cake?
- a.) color
- b.) dietary calories
- c.) volume
- d.) mass
588. Which of the following is an extensive property?
- a.) volume
- b.) hardness
- c.) melting point
- d.) color
589. Which of the following is an intensive chemical property of a box of raisins?
- a.) total number of raisins
- b.) total calories
- c.) total grams
- d.) calories per serving
590. Which of the following is an extensive property of a bubble of air?
- a.) percent oxygen
- b.) temperature
- c.) radius
- d.) density
591. Dalton suggested that atoms were indestructible and unchangeable to explain:
- a.) why mass is conserved in chemical reactions
- b.) why compounds combine in fixed weight ratios in chemical reactions
- c.) why elements combine in fixed weight ratios to form compounds
- d.) why elements are characterized by the mass of their atoms
592. Hydrogen combines with nitrogen in a 3:14 weight ratio to form ammonia. If every molecule of ammonia contains three atoms of hydrogen and one atom of nitrogen, an atom of nitrogen must weigh:
- a.) 14 times the mass of a hydrogen atom
- b.) 3 times the mass of a hydrogen atom
- c.) 3/14 times the mass of a hydrogen atom
- d.) 14/3 times the mass of a hydrogen atom
593. Which of the following is not a postulate of Dalton’s atomic theory?
- a.) different elements have atoms of different masses
- b.) atoms combine in simple whole number ratios to form compounds
- c.) chemical change is a rearrangement of atoms
- d.) atoms of a single element can have different masses
594. Hydrogen combines with oxygen in a 1:8 weight ratio to form water. If every molecule of water contains two atoms of hydrogen and one atom of oxygen, an atom of oxygen must weigh:
- a.) 1/16 times the mass of a hydrogen atom
- b.) 1/8 times the mass of a hydrogen atom
- c.) 8 times the mass of a hydrogen atom
- d.) 16 times the mass of a hydrogen atom
595. Dalton viewed chemical change as:
- a.) a transfer of protons
- b.) creation and destruction of atoms
- c.) a change of atoms from one type into another
- d.) a rearrangement of atoms
596.) When elements react, their atoms combine in:
- a.) a simple whole number ratio (unique for each pair of elements)
- b.) triplets
- c.) simple whole number ratios (more than one possible)
- d.) pairs
597.) Dalton said that elements are different distinguished from each other by:
- a.) the shapes of their atoms
- b.) the weights of their atoms
- c.) the charge on their ions
- d.) the density of their solid forms
598.) Dalton based his relative atomic weight scale on:
- a.) oxygen
- b.) hydrogen
- c.) helium
- d.) carbon
599.) The number of hydrogen atoms in 8 molecules of methanol, CH3OH, is
- a.) 3
- b.) 8
- c.) 32
- d.) 24
600.) Phenylmercuricborate, (C6H5Hg)2HBO3, was once used as a mildewproofing agent. A wood sample sprayed with 4.8 x 1018 molecules of phenylmercuric borate could contain how many mercury atoms?
- a.) 2
- b.) 2.4 x 10^18
- c.) 4.8 x 10^18
- d.) 9.6 x 10^18